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<div class="refentry" title="Cross-compiling the GLib package">
<a name="glib-cross-compiling"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Cross-compiling the GLib package</span></h2>
<p>Cross-compiling the GLib Package — 
How to cross-compile GLib
</p>
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<div class="refsect1" title="Building the Library for a different architecture">
<a name="cross"></a><h2>Building the Library for a different architecture</h2>
<p>
        Cross-compilation is the process of compiling a program or
        library on a different architecture or operating system then
        it will be run upon. GLib is slightly more difficult to 
        cross-compile than many packages because much of GLib is
        about hiding differences between different systems. 
      </p>
<p>
        These notes cover things specific to cross-compiling GLib;
        for general information about cross-compilation, see the
        <span class="application">autoconf</span> info pages.
      </p>
<p>
        GLib tries to detect as much information as possible about
        the target system by compiling and linking programs without
        actually running anything; however, some information GLib
        needs is not available this way. This information needs
        to be provided to the configure script via a "cache file"
        or by setting the cache variables in your environment.
      </p>
<p>
        As an example of using a cache file, to cross compile for
        the "MingW32" Win32 runtine environment on a Linux system,
        create a file 'win32.cache' with the following contents:
      </p>
<pre class="programlisting"> 
glib_cv_long_long_format=I64
glib_cv_stack_grows=no
      </pre>
<p>
        Then execute the following commands:
      </p>
<pre class="programlisting">
PATH=/path/to/mingw32-compiler/bin:$PATH
chmod a-w win32.cache   # prevent configure from changing it
./configure --cache-file=win32.cache --host=mingw32
      </pre>
<p>
        The complete list of cache file variables follows. Most
         of these won't need to be set in most cases.
      </p>
</div>
<div class="refsect1" title="Cache file variables">
<a name="cache-file-variables"></a><h2>Cache file variables</h2>
<p title="glib_cv_long_long_format=[ll/q/I64]"><b>glib_cv_long_long_format=[ll/q/I64]. </b>
           Format used by <code class="function">printf()</code> and 
           <code class="function">scanf()</code> for 64 bit integers. "ll" is 
           the C99 standard, and what is used by the 'trio' library
           that GLib builds if your <code class="function">printf()</code> is 
           insufficiently capable.
           Doesn't need to be set if you are compiling using trio.
        </p>
<p title="glib_cv_stack_grows=[yes/no]"><b>glib_cv_stack_grows=[yes/no]. </b>
           Whether the stack grows up or down. Most places will want "no",
           A few architectures, such as PA-RISC need "yes".
        </p>
<p title="glib_cv_working_bcopy=[yes/no]"><b>glib_cv_working_bcopy=[yes/no]. </b>
           Whether your <code class="function">bcopy()</code> can handle overlapping 
           copies. Only needs to be set if you don't have 
           <code class="function">memmove()</code>. (Very unlikely)
	</p>
<p title="glib_cv_sane_realloc=[yes/np]"><b>glib_cv_sane_realloc=[yes/np]. </b>  
            Whether your <code class="function">realloc()</code> conforms to ANSI C 
            and can handle <code class="literal">NULL</code> as the first argument. 
            Defaults to "yes" and probably doesn't need to be set.
	</p>
<p title="glib_cv_have_strlcpy=[yes/no]"><b>glib_cv_have_strlcpy=[yes/no]. </b>
            Whether you have <code class="function">strlcpy()</code> that matches 
            OpenBSD. Defaults to "no", which is safe, since GLib uses a 
            built-in version in that case.
	</p>
<p title="glib_cv_va_val_copy=[yes/no]"><b>glib_cv_va_val_copy=[yes/no]. </b>
            Whether <span class="type">va_list</span> can be copied as a pointer. If set 
            to "no", then <code class="function">memcopy()</code> will be used. Only 
            matters if you don't have <code class="function">va_copy()</code> or 
            <code class="function">__va_copy()</code>. (So, doesn't matter for GCC.) 
            Defaults to "yes" which is slightly more common than "no".
	</p>
<p title="glib_cv_rtldglobal_broken=[yes/no]"><b>glib_cv_rtldglobal_broken=[yes/no]. </b>
            Whether you have a bug found in OSF/1 v5.0. Defaults to "no".
         </p>
<p title="glib_cv_uscore=[yes/no]"><b>glib_cv_uscore=[yes/no]. </b>
            Whether an underscore needs to be prepended to symbols when
            looking them up via <code class="function">dlsym()</code>. Only needs to 
            be set if your system uses
	    <code class="function">dlopen()</code>/<code class="function">dlsym()</code>.
	 </p>
<p title="ac_cv_func_posix_getpwuid_r=[yes/no]"><b>ac_cv_func_posix_getpwuid_r=[yes/no]. </b>
            Whether you have a getpwuid_r function (in your C library,
	    not your thread library) that conforms to the POSIX spec.
            (Takes a 'struct passwd **' as the final argument)
         </p>
<p title="ac_cv_func_nonposix_getpwuid_r=[yes/no]"><b>ac_cv_func_nonposix_getpwuid_r=[yes/no]. </b>
            Whether you have some variant of <code class="function">getpwuid_r()</code>
            that doesn't conform to to the POSIX spec, but GLib might be able
            to use (or might segfault.) Only needs to be set if 
	    <code class="literal">ac_cv_func_posix_getpwuid_r</code> is not set. It's 
            safest to set this to "no".
         </p>
<p title="ac_cv_func_posix_getgrgid_r=[yes/no]"><b>ac_cv_func_posix_getgrgid_r=[yes/no]. </b>
            Whether you have a getgrgid_r function that conforms to
            the POSIX spec.
         </p>
<p title="glib_cv_use_pid_surrogate=[yes/no]"><b>glib_cv_use_pid_surrogate=[yes/no]. </b>
            Whether to use a <code class="function">setpriority()</code> on the PID of 
            the thread as a method for setting the priority of threads. This 
            only needs to be set when using POSIX threads.
         </p>
<p title="ac_cv_func_printf_unix98=[yes/no]"><b>ac_cv_func_printf_unix98=[yes/no]. </b>
           Whether your <code class="function">printf()</code> family supports Unix98 
           style <code class="literal">%N$</code> positional parameters. Defaults to
	"no".
         </p>
<p title="ac_cv_func_vsnprintf_c99=[yes/no]"><b>ac_cv_func_vsnprintf_c99=[yes/no]. </b>
            Whether you have a <code class="function">vsnprintf()</code> with C99 
            semantics. (C99 semantics means returning the number of bytes 
            that would have been written had the output buffer had enough 
            space.) Defaults to "no".
         </p>
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